If this is all about reducing taxes, then set up a trust and trickle out the taxable money to the child with the lowest income at a rate that you think will keep him under the tax rate of the high earner, until it runs out.If I wanted everything to be even steven I just go 50-50. What I'm trying to do is to do have any inheritance distributed tax efficiently, just like I try to set up my portfolio to be tax-efficient.
The Roth goes to whoever.
The tIRA or conventional 401k would go to the low earner/saver up to the point the dough puts him in the same/worse tax situation as the high earner/saver.
There might be a big disparity in what each receives if things are done like this, but the taxes will be minimized, which is apparently the goal.
Obviously, I wouldn't do that. I'd split it evenly before taxes, give each kid 1/2 of each type of account, and let each figure out the best way to minimize their taxes since they know best what they are earning at the time, what they anticipate they'll earn in the future, if they are going to come into a big pile of money from a spouse's relative, what the tax landscape is like at that time, and what they think it will be like in the future.
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